Once a Greek taxi driver ran his Mercedes diesel for a record-breaking 4.6 million kilometers. Eventually his 1976 240D found its way into a museum, but today’s Mercedes automobiles are a lot different. Modern models are packed with luxury equipment such as hybrid systems, air suspension, electronic controls, sophisticated safety systems and driver-assistance systems. This is why it is extremely crucial to select the appropriate used Mercedes truck rather than just the brand name.

Reliability varies significantly with model, year, engine and mechanical configuration for Mercedes-Benz. There are generations that have a reputation for great durability and others that can be expensive to keep as a car. When it comes to reliability, mileage and looks are not the only factors to consider. When determining if a used Mercedes is a good value, factors like repair records, reliability history, safety performance, engine configuration, suspension setups, and long-term owner feedback are all taken into account.

However, if buyers are willing to diligently investigate, there are still some Mercedes options available on the used car market that are great. There are the E-Class, C-Class, GLC, G-Class, S-Class and SL-Class, all of which can offer great longevity when coupled with the appropriate engines and regular maintenance. Some other model years and powerplants, however, warrant a bit of caution, as issues that are well documented with those specific years and engines can add up to a big problem on the cheap side.

1. E-Class: The Long-Distance Workhorse 

The E-class is still one of the best options for anyone in the market for a used Mercedes that can do a lot of miles. The vehicle’s W212 generation (2010–2016) gained a solid reputation for its durability. The later W213 generation (2018-2022) is also an attractive choice for purchasers looking for newer technology but who do not wish to entirely give up on the tried-and-tested mechanical base.

E-Class Durability and Engine Choices:

• Long-Distance Durability
• Diesel Fleet Provenance
• High-Mileage Potential
• Older Generation Reliability

E220d and E250d variants of the diesel model have been particularly favored by taxi companies in Europe, which are optimized for extended road trips. In good hands, one example is said to have travelled 350,000 to 400,000 kilometres on the original engines. If that is the case, it’s a testament to the E-Class’s status as a Mercedes workhorse.

Even older people are still good targets for expert purchasers. These were the W124 (made from 1984 to 1995) and the W210 (1996 to 2002), which brought in further safety technology and long-lasting engines of M112 V6 and M113 V8 respectively. The W211 (2002-09) may also be drawing in buyers, especially as it is powered by the reliable 3.2-litre V6 diesel that’s offered in the 320 CDI.

2. C-Class Offers Strong Compact Luxury 

The C-Class is a more compact option for those looking for the Mercedes luxury standard without going up the price tier to the E-Class. The W204 (made 2008-14) has continued to have a great used market appeal. The 3.5-liter V6 engine options make for late facelift models (2012-14) interesting.

Compact Luxury and Reliability:

• Compact Luxury Appeal
• W204 Generation Strengths
• W205 Technology Improvements
• Engine Reliability

The W205 generation of the C-Class retained the C-Class formula and the 2.0-liter turbocharged engine, bringing new technology. Crafted facelift versions in subsequent releases corrected the production flaws of earlier releases, and are more appealing for extended ownership. For one, the C400 comes with the mighty 3.5L M276 engine, known for its smooth performance and durability.

Don’t automatically rule out older C-Class models. The W203, which was produced from 2000 to 2007, expanded the popularity of the nameplate with sportier body styles and engines like the 1.8-liter Kompressor inline-four. While buyers should always thoroughly examine any vehicle more than three years old, a vehicle that has been well maintained with a clean bill of health can be very valuable.

4. GLC and GLK Add Durability to SUVs

There are some great choices for used Mercedes SUV shoppers, especially when reliability remains a top priority. The 2018-2020 and later 2024-present GLC 300 models are good options. It’s comfortable, safe and reliable in its engineering, and one of the most appealing Mercedes SUVs for day-to-day driving.

SUV Reliability and Practicality:

• GLC 300 Reliability
• GLK Mechanical Simplicity
• High-Mileage SUV Potential
• Larger Family Options

In the days before the GLC gained in popularity, the GLK 350 provided an easier, but still very capable, option. For the 2013-2015 models, the engine is a 3.5 litre naturally-aspirated V6 that is known to offer long-lasting performance. But owners have cited instances as high as 250,000 miles, when maintenance has been done right, making this SUV worth considering for those who prefer the mechanical reliability of proven technology.

If there’s an extra few passengers in the family, there are options like the 2017-2019 GLS 450, which offer practicality with seven seats. For 2020-2023, the 350 is equipped with a 3.0-liter mild hybrid inline-six engine, useful space and features strong driving qualities. These vehicles also come with a bit more technology than that of older Mercedes SUVs, making maintenance history even more crucial when buying a used model.

4. G-Class and GLA Offer Different Strengths 

For buyers looking for serious off-road capability and the potential for a long lifespan, the pre-2019 W463 G-Class is still a great option. These cars, which have been manufactured between 2006 and 2018 in the specified period, are the direct descendants of a rugged chassis concept. Well-maintained examples with naturally aspirated V8 engines will offer outstanding mechanical longevity.

Ruggedness Versus Compact Practicality:

• G-Class Longevity
• Off-Road Engineering
• V8 Mechanical Durability
• Compact GLA Alternative

If the owners follow proper maintenance schedules, models like the G500 and G550 have gained a reputation with a 200,000 plus mechanical-free track record. They are built significantly different than a standard crossover and that adds to their ruggedness and long-term value.

On the smaller side, the X156 GLA 250 offers a lighter and simpler crossover option. It shares features with the A-Class, and the turbocharged 2.0-liter engine is somewhat helpful in the performance stakes. If you are looking for a smaller Mercedes that could be a high mileage car, you might want to consider the GLA 250, as long as you can have the records of its maintenance.

5. Flagship Sedans and SL-Class Choices 

Purchasing a Mercedes doesn’t mean a compromise on reliability. Models like the M276 V6-equipped S450 are available for the W222 S-Class from 2014-2020, delivering exceptional long-distance comfort. These power trains will achieve about 200,000 miles with proper maintenance, and will still provide all the smooth and responsive driving experience one should expect from the S-Class.

Luxury Performance and Ownership Costs:

• Flagship Sedan Reliability
• Long-Distance Comfort
• Luxury System Repairs
• SL-Class Roadster Appeal

The secret is to realize luxury gear is going to come with extra repair costs. Having a mechanic engine doesn’t rule out pricey comfort, suspension or electronic repairs. So the engine alone should never be the only factor by which the buyer makes a decision about the reliability of a vehicle.

If you’re a fan, the R230 SL-Class roadster from 2003-2012 is an interesting choice. The SL nameplate dates back to 1954 and the SL550 incorporates a strong V8 engine and has impressive mechanical character. Luxury V8 roadsters are attractive to buyers who want an accessible option and with proper maintenance can travel between 150,000 to 200,000 miles.

6. Engines That Deserve Special Attention 

The engine located under the hood may be the main culprit in either a pleasant drive in the Mercedes or costly repair bills for years. One of the most significant high mileage options is the OM651 2.1-liter four-cylinder diesel that was used from 2008-2018. It has been used in models such as the E220d, the C220d and the GLC 220d and has proven to be very durable in challenging fleet applications.

Powertrains Worth Considering:

• OM651 Diesel Durability
• High-Mileage Fleet Performance
• Timing Chain Considerations
• Petrol V8 Reliability

When maintained properly, the OM651 can service 500,000 kilometers. Specific care needs to be taken in early versions with regards to the timing chain tensioner, which corrects can boost owner confidence over the long haul. The all-aluminum body design for the 2.0-liter diesel engine it will replace is aimed at efficient thermal management, and follows the high-mileage design approach.

There are also valuable options available with petrol engines. Manufactured naturally aspirated 5.5-liter V8 engines, like those employed in the G550, E550 and S550 can last over 200,000 miles. The 3.5-liter V6 in Mercedes’ updated 318i is also impressive when outfitted with early-balanced wear-free balance shafts. The M276 engine that is found in C400 and E350 vehicles is also appealing to look at, in terms of performance, refinement and durability.

7. Mercedes Model Years Worth Avoiding 

It’s just as important to know what not to do as it is to know what to do when choosing the best engines. Problems can occur with SBC brakes, fiber-optic electronics and Airmatic suspension in early E-Class W211 (2002-2006) models. When there are several problems due to ageing, these systems can become costly.

Common Problem Areas:

• Early W211 System Problems
• W163 Rust Concerns
• CLA Transmission Issues
• AMG V8 Concerns

Another area where rust can be an issue and lead to some headaches during ownership is the W163 ML-Class body panels. Transmission shudder and too much oil consumption are signs to watch for when considering 2014–2018 CLA 250 models. Reliability is not an issue with all vehicles of those years, but a comprehensive inspection is all the more important.

There are other areas of concern, such as the pre-2010 C-Class diesels with leaking power-steering fluid and pre-2018 AMG 63 models with the M156 6.2-liter V8. Valve-seating issues can occur in the M156 around 100,000 miles. 2012-2015 GLE/ML models with Airmatic suspension buyers also should exercise caution as suspension repairs can be expensive.

8. Verify the Vehicle Before Buying 

It is never worthwhile buying a used Mercedes just because the car is clean and cheap. Vehicle-history verification is a key step in the car-buying process and many of the cars you see for sale have had previous damage. The stats vary, but about 46% of used Mercedes vehicle history reports include accident records making it a great bet that the accident history of a Mercedes is hidden from the unsuspecting buyer.

Vehicle History and Identification Checks:

• Previous Damage Verification
• VIN History Research
• Vehicle Specification Confirmation
• Identification Number Matching

The VIN search will provide valuable details regarding the vehicle specifications, value, recalls, and prior damage. Buyers can use tools like Vincario to explore these aspects prior to buying. The purpose of this is to establish a confirmation of the vehicle being inspected to be the same as what the seller gave.

The VIN should always be compared to the vehicle itself. The buyer should check the ID number at the factory sites such as in the lower portion of the windshield dashboard, B-pillar door frame and engine block. If they don’t match up, it’s a big red flag and shouldn’t be ignored.

9. A Mechanical Inspection Can Save Thousands 

One of the most useful things a used Mercedes Buyer can do is to have a complete inspection done before they purchase the vehicle. Although a low odometer reading may seem more valuable, full service records should be given more weight, as they give a much better understanding of how the vehicle has been maintained over the years.

Inspection Priorities and Ownership Costs:

• Complete Service Records
• Professional Mechanical Inspection
• Engine and Electronics Checks
• Suspension Condition

The qualified Mercedes specialist should take a look at the engine, electronics, suspension, oil leaks, exhaust smoke, body panels, and wheel arches. The inspection should also check for evidence of previous accident repairs and rust. These tests can uncover issues a regular buyer may miss during a brief test drive.

Attention should be given to the suspension configuration. Conventional steel springs may be a more suitable choice than air suspension for buyers who are interested in lower ownership costs in the long run. Steel springs mean that there’s far less chance of failures related to compressors or air bags, and fewer costly suspension components that might need to be replaced as the vehicle ages.

10. Choosing the Right Mercedes for Long-Term Ownership 

When it comes to purchasing a reliable used Mercedes, it’s all about making informed decisions. Many careful choices of E-Class, C-Class, GLC, G-Class, S-Class or SL-Class can offer great mileage when paired with a reliable engine and regular maintenance and kept in pristine condition with a spotless history.

Building a Reliable Ownership Strategy:

• Choosing Proven Powertrains
• Evaluating Long-Term Maintenance
• Checking Vehicle History
• Confirming Mechanical Condition

The OM651 and M276 are good examples of engines that are worth paying attention to. If used in combination with proper servicing these engines can cover hundreds of thousands of miles or kilometers. The vehicle’s suspension, electronics, transmission and other systems are still to be considered, but having a mechanically proven engine is a huge advantage for buyers.

The most used Mercedes is not necessarily the newest, cheapest, or most luxurious. It’s the car that’s in perfect condition on all fronts: the engine’s right, the production year’s right, it has a clean mechanical inspection, verified VIN information, and documented maintenance. With this method, buyers can make many of the costly errors that come with owning an old luxury vehicle and receive the luxury comfort, performance, and driving experience that has made Mercedes-Benz so popular for generations.